If y varies directly as x^2 find k when y = 16 and x = -4.

Icould really use some with this question.

(mc 02.03) what set of reflections and rotations would carry rectangle abcd onto itself? reflect over the y-axis, reflect over the x-axis, rotate 180° rotate 180°, reflect over the x-axis, reflect over the line y=x reflect over the x-axis, rotate 180°, reflect over the x-axis rotate 180, reflect over the y-axis, reflect over the line y=x

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)